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Commit ed610af8 authored Feb 06, 2015 by Pierre-Louis Bossart Committed by Takashi Iwai Feb 09, 2015

ALSA: hda: read trigger_timestamp immediately after starting DMA



Make sure wallclock counter and trigger timestamp are read very
close to each other for better alignment.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

parent 2b79d7a6

sound/pci/hda/hda_controller.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -657,6 +657,9 @@ static int azx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
		azx_writel(chip, SSYNC, azx_readl(chip, SSYNC) & ~sbits);
		if (start) {
		azx_timecounter_init(substream, 0, 0);
		snd_pcm_gettime(substream->runtime, &substream->runtime->trigger_tstamp);
		substream->runtime->trigger_tstamp_latched = true;

		if (nsync > 1) {
		cycle_t cycle_last;